[issue20192] pprint chokes on set containing frozenset

[Joseph Bylund]

New submission from Joseph Bylund:

Expected: pprint the object
Observed: crash with:
set([Traceback (most recent call last):
  File "./test.py", line 7, in <module>
    pp.pprint(myset)
  File "/usr/lib/python2.7/pprint.py", line 117, in pprint
    self._format(object, self._stream, 0, 0, {}, 0)
  File "/usr/lib/python2.7/pprint.py", line 194, in _format
    object = _sorted(object)
  File "/usr/lib/python2.7/pprint.py", line 82, in _sorted
    return sorted(iterable)
TypeError: can only compare to a set


Steps to repro:
#!/usr/bin/python
import pprint
pp = pprint.PrettyPrinter(indent=4)

myset = set(xrange(3))
myset.add(frozenset(xrange(10)))
pp.pprint(myset)

----------
messages: 207693
nosy: jbylund
priority: normal
severity: normal
status: open
title: pprint chokes on set containing frozenset
type: crash
versions: Python 2.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20192>
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